Transcript:

So, let's look at phase transitions. You know, water is a unique molecule. We can see all its phase transitions — in fact, both of its phase transitions — in temperatures, in temperature zones that are about what we would experience in day-to-day life. It freezes around 0°C, and it evaporates around 100°F — not around 100°F! Around 100°C. It's unique.

Hardly anything else does these phase transitions at these temperatures — for example, metals. Metals would do a solid-to-liquid phase transition called melting at temperatures that are so high that you would never experience them in day-to-day life. And on the other side, gases would liquefy at extremely cold temperatures.

Water is unique in that its phase transition happens at temperatures that are about what is life-sustaining. Water is unique, and there are so many other things that water does. We'll look into it.